"Blue" antifreeze or Monoethylene glycol contains silicates, nitrates & phosphates to act as corrosion inhibitors whereas the pink/red contains
organic additives.
Without silicates, silicate gel or "green goo" does not form. By eliminating phosphates, hard water scale is reduced.
Without silicates, phosphates, nitrates, nitrites and borates, abrasive dissolved acids are greatly reduced thereby diminishing water pump seal failures.
Without amines and nitrites, there is no potential formation of nitrosamines.
All of this results in a considerably longer life span, whilst providing improved protection of all cooling system metals, including aluminium. Benefits over conventional silicate based coolants are:
Improved water pump life due to reduced water pump seal wear.
Fewer abrasive dissolved solids.
Reduced hard water scale.
Virtually no deterioration of heat transfer capacity during service life.
Excellent protection against high temperature and pitting corrosion. No silicate gel formation during storage or use.
Effective long-term corrosion protection for aluminium, brass, cast iron, steel, solder and copper alloys. Long effective service life of up to 10 years or 150,000 miles.
The two types of coolant should not be mixed. Vehicles filled with MEG will have coolant coloured blue, green or yellow. MEG with organic additives will have coolant coloured pink/red.
